I agree with Sophie that Anne Metcalfe's book (in the Millers range) is probably the best starter as it really is a good summary, both in text and images, of all sorts of paperweights from all sorts of places. And it can be found on eBay for very little cost.
But I also agree with Alexander, that Sibylle Jargstorff's book is great for a more detailed coverage of paperweights world wide.
As for trying to get a representative sample of world weights in a 10 - 15 item collection, I tend to agree again with Sophie. But ... as an example ...
A couple of years ago, the folk at Cambridge Glass Fair asked the Paperweight Collectors Circle if they could put on a "Foyer Exhibition" of weights. When considering a theme, it was decided to replicate a 1,000+ weight exhibition, held the previous year at the week-long London Olympia Antiques Fair, covering makers from around the word, antique to modern. And this replication was going to fit into three glass cabinets against one small wall of the foyer at the entrance to the glass fair!!! It was done reasonably well - but with approximately 60 weights, not 15 maximum.
The problem is, once you decide what weights to collect, you will then keep finding better examples of the ones you have and will end up improving all the time. And you will extend the millefiori collection as well, once you reaslise the sheer variety of patterns and colours available. And then you will start to examine the minute detail of all your weights, and that will start you off in another collecting theme ...
But you might not
